In angiosperms, pollination transfers pollen from an anther to a stigma. Fertilization is a later fusion of gametes; seed development follows. Pollination may use animals, wind or water, so an insect visit is neither required for every flower nor sufficient evidence of fertilization.[ref]
32.2 Pollination and Fertilization. Biology 2e, §32.2 opening definition, Pollination by Wind and Pollination by Water
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